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Old 01-03-2019, 04:01 AM   #76
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You can tell from the write up that this is a true labor of love
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Old 01-03-2019, 09:00 PM   #77
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Torch,
Just trying to pass along information it's taken me most of a lifetime to learn. Wish I'd had something like this to refer to...
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Old 01-04-2019, 04:12 AM   #78
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Quote:
Originally Posted by 7TRoadster View Post
Wish I'd had something like this to refer to...
You and me both
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Old 01-04-2019, 08:56 AM   #79
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Prime, Block & Repeat (2)

You want to correct these challenges in the lowest level of the substrate possible. Given that you're going to find a few that were missed during the next prime & block. Fix those blemish areas as follows: Sand the area of the blemish with 100 grit paper, get some deeper scratches in there to promote adhesion for the spot putty. Do this for several spots in the area. Mix up a small batch of putty and apply it over the area with a putty knife larger than the area. Apply with light pressure, you want the putty slightly higher than the blocked surface but not gobbed on there such that it requires excess blocking to get flat again. Putty can be applied up to about 1/32 thick, but should not be used in the larger areas. Beyond that prep the area with 100 grit and apply filler.

The larger areas represent a bigger challenge because you need to figure out how much correction is required. Lay a straight edge across the area and look to see just how low it is. If its less than 1/32 you can usually fill with a spot prime, if it's closer to a 1/16" then you need to remove the primer from that area and add filler. If it's an 1/8" or more a layer of glass is needed. Usually that is not the case because a spot that deep is visible before priming.

Photo shows some small blemishes prepped for putty.
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Old 01-04-2019, 09:11 AM   #80
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Prime, Block & Repeat (3)

Question from local follower....

Do you have a photo of the nicks as they are discovered? He didn't know what to watch for.

Photo is of some nicks as they appear after you block the first primer.
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Old 01-04-2019, 09:14 AM   #81
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Prime, Block & Repeat (4)

The putty will dry in about 15 minutes. Block it flat with the same 220 grit you've been using. Work your way around the car prepping and filling these small spots with putty. Address the larger spots as described, apply the prescribed remedy, when dry block it down as well.

Photo shows putty applied and blocked. Notice the 100 grit scratches are clearly visible under the 220 grit surface blocking.
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Old 01-06-2019, 09:46 AM   #82
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Prime, Block & Repeat (5)

Make sure doors, hood and t-tops are closed and latched. They were adjusted to fit in the foundational steps above. When blocking the edges, block flat across the gaps. You want the contour to flow across the gap seamlessly. Easy for the hood, t-tops and front edges of the doors. The hardest one on the Corvette is the lower rear half of the doors, the gap is in the edge area of a convex curve. A correct contour will have the front edge of the quarter panel slightly higher than the rear edge of the door. Be careful in this area, use the rounded block and roll it from the fender lip toward the gap. Block the door front to back, try to stay off the edge of the quarter panel.

Photo shows blocking across gaps. The door was raised to fix the upper door gap too.
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Old 01-07-2019, 08:17 PM   #83
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Prime, Block & Repeat (6)

Spot prime the blemishes and block again. Those larger low spots can use a squirt a primer too. This is my own technique, allow only one spot prime between full coats of primer. This keeps the primer thickness reasonably close to uniform. If you spot prime too much you wind up with a wavy surface and inflict more blocking on yourself. Don't forget to sand edges and recesses then check them for blemishes too.

Spot primer completed and blocked, now a second full base prime is in order. If you have taken the time to really work on the body at the stage above, the second prime will be eye opening in that you won't believe how much better the body looks. Again with 220 grit and the longest blocks possible for the areas, block it down. Mark the low spots with tape and move on. At this point try not to break through the primer down to glass. If you see the fiberglass lightening up through the primer, stop blocking that area and move on.

Again perform remedy processes to the things you missed, there shouldn't be many. Give the corrections a spot prime, plus the larger low spots another splash of spot primer and block all. It should be fairly evident why black primer is used as a base primer over the gray glass. The glass then becomes visible as the primer becomes thin from blocking. If gray primer is sprayed over gray glass this visibility is greatly reduced.

Photo shows the second coat of primer blocked and spot primer applied.
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Last edited by 7TRoadster; 04-09-2019 at 09:00 AM.
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Old 01-09-2019, 11:35 PM   #84
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Prime, Block & Repeat (7)

The base primer should be done at this point. Now it's time for the finish primer. Switch to the gray primer and apply a full coat. Guide coat is applied as a fog, after the primer is dry spray it from 18"-24" from the panel in big sweeping motions, cover the whole car. Now you get to block again with 220 grit. This time you will be watching the guide coat come off as you block. Low spots become much more visible because you can visually see the adjacent area has the guide coat is blocked off. Block these areas until you see the guide coat disappear or black primer starting to emerge under the gray. You shouldn't have many of these areas, usually they are around the edges of the larger low spots. Stop and move on, no need to tag as the black spot is visible. Try not to sand into the black primer, a little bit is probably OK, but if you break through to glass you gotta go back spot that with black and build up again.

Photo shows finish primer and guide coat applied.
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Old 01-15-2019, 11:05 AM   #85
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How guide coat works.

Close up of guide coat when applied
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Old 01-15-2019, 11:06 AM   #86
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How guide coat works.

Blocking with 220 grit on the door area. You can see a slight low spot in the center and a scratch. The area around it clear of guide coat.
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Old 01-15-2019, 11:07 AM   #87
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How guide coat works.

Continued blocking shows the low spot getting smaller and the guide coat turning a lighter shade. The primer is porous so a small amount of the guide coat soaks into the primer. Block until the guide coat isn't visible.
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Old 01-15-2019, 11:08 AM   #88
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How guide coat works.

The low spot is blocked out, no guide coat is visible.
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Old 01-15-2019, 11:09 AM   #89
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How guide coat works.

Here is one that doesn't go so quite as well.

Two low spots can be seen toward front edge.
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Old 01-15-2019, 11:11 AM   #90
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How guide coat works.

Continued blocking reveals base primer emerging through finish primer.
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